Cisco Nonstop Forwarding (NSF) with Stateful Switchover (SSO) has proven to be extremely effective at increasing availability of network services. Cisco NSF with SSO provides continuous packet forwarding, even during a network processor hardware or software failure. In a redundant system, the secondary processor recovers control plane service during a critical failure in the primary processor. SSO synchronizes the network state information between the primary and the secondary processor. For more information on NSO please refer to the following URL.
